using System;
using System.Collections.Generic;
using System.Text;
using VSSDKAssist.Assets.ValueProviders.Base;
using Microsoft.Practices.Common;
using EnvDTE;
using System.IO;
using VSSDKAssist.Assets.Helpers;
using System.Globalization;

namespace VSSDKAssist.Recipes.Common.ValueProviders
{
	/// <summary>
	/// Value provider for the VSPackage resx ProjectItem
	/// </summary>
	public class VSPackageResxProjectItemValueProvider : ValueProviderBase
	{
		#region Constants
		private const string VSPackageCodeClassArgument = "VSPackageCodeClassArgument";
		#endregion

		#region Fields
		private string vsPackageCodeClassArgument;
		#endregion

		/// <summary>
		/// Contains code that will be called when recipe execution begins. This is the first method in the lifecycle.
		/// </summary>
		/// <param name="currentValue">An <see cref="T:System.Object"/> that contains the current value of the argument.</param>
		/// <param name="newValue">When this method returns, contains an <see cref="T:System.Object"/> that contains
		/// the new value of the argument, if the returned value
		/// of the method is <see langword="true"/>. Otherwise, it is ignored.</param>
		/// <returns>
		/// 	<see langword="true"/> if the argument value should be replaced with
		/// the value in <paramref name="newValue"/>; otherwise, <see langword="false"/>.
		/// </returns>
		/// <remarks>By default, always returns <see langword="false"/>, unless overriden by a derived class.</remarks>
		public override bool OnBeginRecipe(object currentValue, out object newValue)
		{
			newValue = null;

			if((currentValue == null) && (this.ExecutionStage != Stage.OnBeforeActions))
			{
				CodeClass vsPackageCodeClass = DictionaryService.GetValue(vsPackageCodeClassArgument) as CodeClass;

				if(vsPackageCodeClass != null)
				{
					string resxFileName =
						string.Format(
							CultureInfo.CurrentCulture,
							"{0}.{1}",
							Path.GetFileNameWithoutExtension(vsPackageCodeClass.ProjectItem.Name),
							"resx");

					ProjectItem item = VSIPHelper.FindItemByName(vsPackageCodeClass.ProjectItem.ContainingProject.ProjectItems, resxFileName, true);

					if(item != null)
					{
						newValue = item;
						return true;
					}
				}
			}

			return false;
		}

		/// <summary>
		/// Called when [configure].
		/// </summary>
		/// <param name="attributes">The attributes.</param>
		protected override void OnConfigure(System.Collections.Specialized.StringDictionary attributes)
		{
			if(attributes == null)
				throw new ArgumentNullException("attributes");

			if(attributes.ContainsKey(VSPackageCodeClassArgument))
			{
				vsPackageCodeClassArgument = attributes[VSPackageCodeClassArgument];
			}
		}
	}
}